Noise reduction apparatus in an FM stereo tuner

Details Noise reduction apparatus in an FM stereo tuner Noise reduction apparatus in an FM stereo tuner

1989-11-29

1991-11-19

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 1, 381 94, 381106, H04H 500

Patent

active

050671570

ABSTRACT:
A noise reduction apparatus in an FM stereo tuner including a circuit for generating a stereo sum signal and a stereo differential signal; a noise eliminating circuit for dividing, in accordance with several frequency bands, the stereo differential signal into several divisional signals and for outputting, in accordance with signals levels corresponding to the frequency bands, a composite signal of divisional stereo differential signals respectively corresponding to the signal levels; and a circuit for reproducing a stereo signal from the composite signal and the stereo sum signal. In another embodiment, the noise reduction apparatus includes a circuit for generating a stereo sum signal and a first stereo differential signal; a noise eliminating circuit for dividing the stereo sum signal and the first stereo differential signal into several division differential signals and several divisional sum signals, for eliminating a low-level divisional stereo differential signal in each of the frequency bands to generate a second stereo differential signal, and for outputting a composite signal representing the second stereo differential signal and those divisional stereo sum signals in the same divisional band as the eliminated divisional stereo differential signals; and a circuit for reproducing a stereo signal from the composite signal and the stereo sum signal.

REFERENCES:
patent: 3673342 (1972-06-01), Muller
patent: 3803357 (1974-04-01), Sacks
patent: 3857104 (1974-12-01), Sacks
patent: 3943293 (1976-03-01), Bailey
patent: 4208547 (1980-06-01), Simeau
patent: 4301541 (1981-11-01), Tanaka
patent: 4680793 (1987-07-01), Sugai et al.
patent: 4771464 (1988-09-01), Kadin et al.
patent: 4833715 (1989-05-01), Sakai
Ives, Fred H., "A Noise-Reduction System: Dynamic Spectral Filtering", Journal of the Audio Engineering Society, Sep. 1972, vol. 20, No. 7, s. 558-561.
Rauschverminderung bei Tonubertragungen, Funkschau 25/1984, s. 59, 60, 49-50.

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